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The fine mist spray bottle is designed with the safe and hygienic material, and this material is completely harmless to human. You can reusable these bottles.
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The zone of proximal development, often abbreviated as ZPD, is the difference between what a learner can do without help, and what they can't do. The concept was introduced, but not fully developed, by psychologist Lev Vygotsky (1896–1934) during the last ten years of his life.